RADIATOR ARRANGEMENT STRUCTURE OF MOTORCYCLE

摘要

PROBLEM TO BE SOLVED: To easily enhance a cooling performance of a radiator disposed at a limited space in a tunnel cover and to efficiently cool auxiliary machines for engine by a cooling exhaust air after passed through the radiator in a motorcycle. SOLUTION: In a car body frame 50, a down tube 52 is descended from a head pipe 51 and a horizontal tube 53 rearwardly extends from an intermediate portion or a lower end of this down tube 52. The horizontal tube 53 has an approximately reverse U shape cross section and is surrounded by a tunnel cover 43 of which front and rear portions are opened. A radiator 60 and an engine 21 are arranged in this tunnel cover 43 in this order. When a motor bicycle 10 is viewed from a side portion, the radiator 60 is inclined against a vertical line by a constant angle.